Learning Forum

[Átyla Matheus]

Good morning everyone, I would like help with this simulation. I am sending the attached image.
There are two concentric cylinders, between them there is a fluid (oil) and this interior has porosity and permeability. In the smaller cylinder there is an entry condition where a fluid (water) will enter. In the upper and lower parts a stationary wall condition is defined. In addition, in the outer (larger) cylinder, a pressure condition from the outside to the inside of the cylinder is defined.

My question is how to define in FLUENT that there is a fluid entering and another fluid residing between the two cylinders.
Also, I'm not sure how to define porosity and permeability inside.

Please could someone help me? :)

[Rob]

As the two fluid aren't miscible you'll need a multiphase model. Permeability is set in the cell zone conditions. I suggest you start by clicking on the Help button and navigating up the links until you find the tutorials. 

[Átyla Matheus]

I followed all the steps in the FLUENT GUIDE and accessed all the Helps on the pages, but at the end of the simulation the fluid did not invade. Do you have any tutorial similar to this case or have any tips?

[Rob]

If you're using Fluent I suggest doing the post processing there too: CFD Post may look prettier but it's another tool you (don't) need to learn. 

If you're adding the other phase using VOF patch the first cell layer with the same fluid as is coming from the inlet. It's an old (and well known) trick to prevent the solver doing anything weird with the volume fractions.